Pro-Russian self-defense forces have stormed the Ukrainian navy's Black Sea headquarters in Sevastopol and raised the Russian flag above the building less than 24 hours after Vladimir Putin announced the annexation of Crimea in a searing speech to political elites in Moscow, Guardian reports.

According to RFE/RL, about 200 "self-defense" forces were involved in the attack on the Sevastopol base and that troops loyal to Kyiv barricaded themselves indoors during the incident.